Electrical condenser



Nov. 10, 1931. c. H. KlNDL ELECTRICAL CONDENSER Filed March 21, 1927 l 2 4 m z 2 m 2 Z/% J I I 1 1 1 I r Fig. 2.

Patented Nov. 10, .1931

UNITED") STATES PATENT OFFICE ems. xnmL, or DAYTON, OHIO, assmnoa TO Demo-am oonrona'rxou, or

' DAYTON, omo, a coarom'rron or DELAWARE I ELECTRICAL CONDENSER Application filed March 21, 1927. sci-m no. 176,889.

This invention relates to electrical condensers of the type comprising two long insulated strips ofmetal foil rolled into cylindrical form, and contained within the water proof 5 case, preferably of metal.

One of the objects of the present invention is to provide for more economical manufacture of condensers of this t pe.

Further objects and a vantages of the present invention will be apparent from the following description, reference being had to the accompanying drawings wherein a preferred embodiment of one form of the present invention is clearly shown.

In the drawings:

' Fig. 1 is a longitudinal sectional view on an enlarged scale of a condenser constructed in accordance with the present invention; and

Figs. 2 and 3 are plan and edge views respectively of one of the elements; of the condenser shown in Fig. 1, Figs. 2 and ,3 being drawn'to a scale one-half that of Fig. 1.

Referring to the" drawings, the condenser is formed bywinding insulated strips 20 and 21 of metal foil upon a cylindrical, tubular core 22 of insulating material. The layers of foil 20 and 21 are separated by at least two layers of insulating paper 23.. After the con denser has been wound into cylindrical form, 20 several turns of paper 24 are wound about c this form. It will be noted that one side mar-- {in of the foil strip 20 extends beyond one side margin of the aper insulation 23, and that the opposite si e margin of the foil 21 :15 extends beyond the other side margin of the paper 23. As'viewed in Fig. 1, the upper mar gin of the paper 24 extends beyond theiipper margin of the paper 23 a distance suflicient to accommodate a thin metal washer, which 49 will be described, but the lower margin of the paper wrapping'24 extends a distance below the lower margin of the paper 23 suflicient to permit the paper 24 to be rolled over the edge of the cylindrical form, thus providing :5 an inwardlyextending insulating flange 25. .As is well known to makers of this type of condenser, the side margins of the foil strips maybe readily crushed together to form in eflectmasses of foilmetal at each end of the condenser formin order to' provide means for attaching other conductors to the condenser foils. An insulated stranded conductor is inserted through the tubular core 22 and its bared end 33 is flattened out against the overlapping side mar 'ns of the foil strip 21, 55 these side margins ing indicated by numeral 21a. Then a drop of solder is placed upon this end of the condenser form in order to e trically connect the wire strands 31 with the foil margin 21a. 1

A drawn metal tubular case 40 is formed so that its inside diameter will be slightly greater than the outside diameter of the paper wrapping 24. Then a non-conducting disc 41 is placed upon the bottom or end wall 42 of u the case 40. Originally the upper or open end of the case 40 is formed as indicated by the dot and dash lines 40a, which indicate the shape of the case before the flange 45 (to be described) has been formed. Prior to form- 7 ing the flange 45, the assembly of insulated foil strips 20 and 21, core 22'and wire 30 is inserted within the case 40 and is forced toward the end wall 42 so that the paper flange 25 fits closely against the non-conducting disc 41. A resilient sheet metal washer 50, of good conducting material, is formed as shownin Figs. 2 and 3 with its two halves in separate .planes and in diverging relation, as shown in Fig. 3., The washer is provided with projecso tions or points 51. One of these washers is next placed around the upper end of the tubular core 22 and a condenser end member 52, having a central hole 53 for receiving the wire 30, is placed against the washer 50 and is'forced toward the condenser form with substantial pressure suflicient to cause the spirally formed margin 20a of the foil 20-to be matted together, and to cause the points 51 to be forced into this matted materialvso as to make a good electrical contact between the washer 50 and the condenser foil 20. While this pressure is applied to the condenser end 52, the end margin of the case 40 is formed over upon the outer surface of the 05 condenser end wall 52, in order to provide a flange 45 which retains the end wall 52 in position and the. condenser material firmly supported against endwise movement within the case.; The joint between the flange 45 and the end wall 52 is sealed preferably by soldering, as indicated by numeral 46. This soldered joint tends to prevent the entrance of moisture into the condenser and assists in making a good electrical contact between the foil and the condenser case 40, which serves as one of the condenser terminals.

The opening 53 in the condenser end wall 52 is surrounded by a flange 5a which is reversely flared so as to provide a surface 55 which is relatively gradual in curvature so as to prevent breaking of the wire due to bending it relative to the condenser. The flange 55 assists in stifiening the end wall 52. While the form of embodiment of the pres ent invention as herein disclosed, constitutes a preferred form, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow.

What is claimed is as follows:

1. An electrical condenser comprising, a tubular non-conducting core two foils and foil insulation wound upon the core with the side margin of each strip projecting beyond opposite side margins of the insulation to provide terminals at each end of the condenser assembly, a conductor extending through the core and connected to one of the condenser foils, a wrapping of sheet insulating material about the assembly and having the margin,

which is adjacent the condenser terminal connected with the conductor, extended beyond said terminal and folded over against it, an insulating disc located against the folded margin of the wrapping and cooperating therewith to enclose the terminal connected to the conductor, a closed-end tubular case sur rounding the assembly and wrapping and having its closed end located against said disc,

a resilient, normally-arched metal disc located against the other condenser terminal and within the case, and a metal end wall member apertured to receive said conductor and located against said normally-arched disc, and means for maintaining said disc and end wall member in position including an inwardly extending annular flange provided by the tubular case.

2. An electrical condenser comprising, in combination, a non-conducting tubular core, condenser material comprising condenser foils and strip insulation wound upon said core in such manner-that a side margin of each foil pro ects from each side margin of .the foil insulation, a conductor extending through said, core and attached at one end to a foil margin, a tubular metallic case closed at one end, and receiving the assembly of condenser material, core and conductor, the conductor .end which is attached to a foil margin being located adjacent the closed end of the case, means insulating the condenser from the interior wall surfaces of the case, and a metallic end member for closing the case and for electrically connecting the foil margin adjacent thereto with the case, and cooperating with the case to maintain the condenser materialelamped between the end member and the closed end of the case, said end member having an aperture through which said conductor passes.

3. In a condenser, the combination with a tubular core member; of a plurality of insulated condenser foils wound about said core; a terminal conductor metallically joined to the coiled side margin of one of said foils, and extending through said core for mechanically anchoring said conductor, a wrapping of sheet insulating material about the wound foils including an end margin thereof folded over against the end portion of said wound foils, and an insulating disc located against the juncture of said. foil and conductor, a closed end tubular case surrounding the wound foils and insulated from a portion thereof by said wrapping and disc, and anvend closure for said case elec trically connected with another of said foils, including a resilient, normally arched metal disc with provisions for piercing the coiled side margins of another of said foils.

4. In a condenser, the combination with a tubular, non-conducting core; of a plurality of insulated foil sheets wound about said core; a cylindrical casing enclosing the core and condenser foils; an insulated stranded wire terminal conductor passing through an opening in one end of the casing and electrically connected to a margin of one of the foils, said conductor extending through the non-conducting core for anchoring the conductor to the condenser assembly; a wrapping of non-conducting material about said foil windings and folded against the end thereof for insulating some of said foil margins, and a resilient disc engaging others of said foil margins and the end of said case providing said opening and for electrically connecting the said foil margin and the case.

5. An electrical'condenser comprising elements of electrically conductive material separated by insulation and wound together, and a terminal extending through the middle of the condenser from one end'to and past an edge of the insulation at the other,

and having a portion bent so as to connect with one of said elements.

6. A condenser comprising a plurality of strips of electrical conductive material of opposite polarity, separated by insulation and wound together, one of said strips projecting to one end of said condenser, and one to the opposite end, and a terminal extending through the middle of the condenser and projectingfrom one end thereof, said terminal having an insulated covering and being bent at one end, the bent portion being connected to one of said strips at the opposite end of the condenser.

7 An electrical condenser comprising a tubularcore, condenser foils and foil insulation wound with a side margin of each.

succeeding foil projecting beyond opposite side margins of the insulation to provide a terminal at each end of the condenser assembly, a wire extending through the core and connected to a terminal at one end of'the assembly, a tubular metallic case having an integral closed end surrounding the assembly with the closed end adjacent the terminal to which the wire is connected, means insulating the assembly from the interior of the case, a conducting end wall member, said end being provided with an aperture for the wire extending through the core and said end wall closing the open end of the case, and means for electrically connecting the other condenser assembly' terminal with the case including a resilient spring metal washer located between the end wall and condenser assembly terminal said case having an annular flange formed against the end wall member to retain the same and to clamp the spring washer against the condenser assem bly terminal.

8. A condenser comprising, in combination,

' a tubular body of windings of foil strips and insulation strips, the coiled outside margins of the foil strips extending oppositely from the coiled side margins of the insulation strips, 'a wire extending through the body and having an end electrically connected with a foil margin, a tubular case having a closed end adjacent the wire end, a conductor located adjacent the open end of the case and electrically connected with another foil,

means for closing the open end of the'case, and means including a part of the case for clamping-the adjacent conductor against the body and the body against the closed end 01 the case.

9. A condenser comprising, in combination, 'a tubular condenser body, including a plurality of insulated foils, a wire extendlng through the body and having an end electrically connected with one of sald foils, a tubular case having a closed end adjacent the wire end, aconductor located adjacent the op 11 end of the case and electrically connected with another foil, means for closing the open end of the case and means including apart of the case for clamping the adjacent conductor against the body.

10. A condenser comprising, in combina tion, a tubular condenser body, including a plurality of insulated foils. a wire extending through the body and having an end electrically connected withone of said foils, a tubular case having a closed end adj acent the wire end, a conductor located adjacent the open end of the case and electrically connected with another foil, means for closing the open end of the case and for clamping the adjacent conductor against the body, said case having a flange formed against the closing means to glanp the adjacent conductor against said 11. An electrical condenser comprising a tubular core, condenser foils and foil insulation wound with a side margin of each succeeding foil projecting beyond opposite side margins of the insulation to provide a terminal at each end of the condenser assembly, a

wire extending through the core and connected to a terminal at one end of the assembly, a tubular case closed at one end surrounding the assembly with the closed end adjacent the terminal to which the wire is connected, means insulating the assembly -fromthe interior of the case, a conducting case cover member, said cover provided with an aperture for the wire extending through the core and said cover closing the open end of the case, and means for electrically connectingthe other condenser assembly terminal with the case including a resilient spring between said end of the case and said end of the wire, a cover for the open end of the case, said cover having an aperture through which the wire passes, means for connecting another foil with the case, and common means including a part of said case for securing the cover tothe case and for clamping the condenser body against the insulation member.

13. A condenser comprising, in combination, a tubular body comprising windings of foil strips and insulation strips, a tubular metallic case enclosing said body, said case having an integral closed end, an insulated wire extending through said body and including a conducting part. electrically connected with afoil and extending along the end of the condenser body adjacent the closed end of the case, a cover for the open end of the case, said cover having an aperture through which the wire passes, means for connecting another foil with the case, common means including a part of said case for securing the cover to the case and for clamping the conducting part against the adjacent end ofthe condenser body.

14. A condenser comprising, in combination, a tubular body comprising vwindings of foil strips and insulation strips, a tubular metallic case enclosing said body, said case having anintegral closed end, an insulated wire extending through said body and including a conducting part electrically connected with a foil and extending alon the end of the condenser body adjacent the c osed end of the case, a cover for the open end of the case, said cover having an aperture through which the wire passes,emeans for connectingeanother foil with the case, an insulatingmember adjacent the closed end of the case and common means including a part of said case for securing the cover to the case and for clamping the conducting part be tween the condenser body and the insulating member.

15. A condenser comprising, in combination, a tubular body of windings of foil strips and insulation strips, the coiled outside margins of the foil strips extendin oppositely from the coiled side margins oi the insulation strips, a wire extending through the body and having an end electrically connected with a foil side margin, an integral.

extending through the body and having an end contacting with a foil strip, a tubular case having an integral closed end adjacent the wire end, a conductor located adjacent the open end of the case and electrically connected with another foil, a cover for thegopen end of the case and having an aperture through which the wire passes, and means including a part. of said case for securing the cover and for clamping the adjacent conductor against the body.

17. A condenser comprising, in combination, a tubular condenser body comprising wound foil strips and insulation strips, an insulated wire extending through the body and having a bared end cont-acting with a foil, a tubular case having an integral closed 'end adjacent the wire end, a conductor located adjacent theopen end of the case and electrically connected with another foil,

means for closing the open end of the case, "and for clamping the adjacent conductor against the body said means including a part of the case.

" i 18. A condenser comprising, in combination, a tubular metallic casehfiving an' integral end wall, a cover'for the open end of the case, a tubular body of condenser mate rial comprising windings of foil strips and insulation strips, and located within the case, means for connecting one of the strips with the case, a terminal conductor insulated from the case and passing through the cover, means for connecting the insulated terminal with the other foil strip, and means including a part of the case for attaching the cover to the case and for securing against disruption the means which connects a foil with the insulated terminal.

19. A condenser comprising, in combination, a tubular metallic case having an integral end wall, a cover for the open end of the case, a tubular body of condenser material comprising windings of foil strips and insulation strips and located within the case, means for connecting one of the strips with the case, a terminal conductor insulated from the case and passing through the cover, means for connecting the insulated terminal with the other foil strip, and means including a part of the case for attaching the cover to the case and for securing against disruption the means which connects a foil withthe case.

20. A condenser comprising, in combination, a tubular metallic case having an integral end wall, a cover for the open end of the case, a tubular body of condenser material comprising windings of foil strips and insulation strips, and located within the case, a terminal conductor insulated from the case and passing throu h the cover, conducting devices for connectmg the foils respectively with the case and insulated terminal, and means including a part of the case for attaching the cover to the case and for clamping the condenser body between the cover and end wall of the case.

21. A condenser comprising, in combination, atubular metallic case having an integral end wall, acover for the open end of the case, a body of condenser material within the case and comprising windings of foil strips and insulation strips, a terminal conductor insulated from the case and passing through the cover," conducting devices for connecting the foils respectively, with the case and insulated terminal, a non-conducting disc located between the condenser body and the-closed end of the case, and means provided by a part of the case for securing the cover in osition and for clamping the condenser bo y against the nonconducting disc.

22. A condenser comprisin in combination, a tubular metallic case liaving an integral end wall, a cover for the open end of the case, a body of condenser material within the case and comprising windings of foil strips and insulation strips, a terminal conductor insulated from the case and passing through the cover, conducting devices for connecting the foils respectively, with the case and insulated terminal, a non-conductin disc located between the condenser body and a and the closed end of the case, a non-conducting tubular body surrounding the condenser body and having its ends abutting the disc cover respectively, and means including a part of the case for securing the cover in position against the non-conducting tubular body and the latter against the non-conductin disc.

23. condensercomprising, in combination, a tubular metallic case having an integral end wall, a cover for the open end of the case, a body of condenser material within the case and comprising windings of foil strips and insulation strips, conductors connected respectively with the foil strips, one of said conductors having longitudinally of the condenser body and a part extending part way across the inner end of the body, and means including a part of the case for securing the conductors and 0 cover in position.

In testimony whereof I hereto afiix my signature.

CARL H. KINDL,

a part extending 

